Why is Apple CarPlay draining your phone battery?

Apple CarPlay drains battery because the iPhone renders the entire interface and streams it to the car display, using significant processing power. Wireless connections worsen the drain since the phone cannot charge while powering CarPlay, and GPS-heavy apps like Waze or continuous Spotify streaming further increase consumption, especially in weak signal areas. To mitigate loss, use a wired connection, enable Low Power Mode, turn off the phone’s screen, and download media locally.